*Growth and Reproduction
• *Some bacteria can divide every 20 minutes
– If there were unlimited resources, 1 bacteria could grow
into a mass 4000 times the mass of earth in just 48
hours!!!
What is the role of bacteria in our world? List
everything you know
Are living:
1.
2.
3.
4.
5.
6.
Made up of cells
Have DNA
Grow and develop
Use energy
Homeostasis
Reproduction
SMART
1) Binary Fission
• Binary Fission:
– Asexual reproduction where organism replicates
DNA and divides in half
– Produces two identical daughter cells
Reproduction
Binary fission
2) Conjugation
• Conjugation: (“bacterial sex”)
– Sexual reproduction where organism exchange
genetic information
SMART
Come back!!!!!
Shapes
Cocci
Bacilla
Spirilla
Shapes
Streptococus
Staphlococus
Streptobacilla
Staphlobacilla
Streptospirilla
SSSS
S
Staphlospirilla
Some are BAD and make us ill
Streptococcus
Strep throat
Pnemonia
Tetanus (lock jaw)
Affects nervous
system
E. coli
Some in our
intestines …
others are
pathogens that
can cause kidney
failure
Bacteria
Can be bad … but can be good
Feel better with??
Importance of Bacteria
Decomposers
• Break down things into simpler materials and
release into the soil
• *Help breakdown sewage treatment water
Nitrogen Fixers
• Converting nitrogen gas into a form plants can
use
– Allows nitrogen to cycle through biosphere
Other Uses
• E. coli in our intestines
– Make vitamins that we cannot make
• Oil digestion
Archaebacteria!
Archaea
• Lack peptidoglycan walls and have different
membrane lipids than Eubacteria
• DNA sequences are closer to Eukaryotes than
Bacteria
Extremophiles
• Extremophiles:
– Live in extreme environments!
Halophilic: salt loving
Thermophilic: heat loving